RFR: 8302652: [SuperWord] Reduction should happen after loop, when possible [v2]

[Emanuel Peter]

On Mon, 8 May 2023 07:51:52 GMT, Pengfei Li <pli at openjdk.org> wrote:

>> Do we even have any other Vector Phi's? SuperWord never does it. Maybe in the Vector API?
>
> My colleague working on VectorAPI just told me yes. A scalar phi may eventually become a vector phi after several transformations in vector intrinsics and vector box/unbox optimizations.

Ok, I can remove it. The user probably does not care about that so much, more about the vector instructions that actually end up in the code-gen.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13056#discussion_r1187150209